package com.hmdp.interceptor;

import com.hmdp.dto.UserDTO;
import com.hmdp.utils.UserHolder;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import org.springframework.web.servlet.HandlerInterceptor;

public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler) throws Exception {
        // 1.获取session
        HttpSession session = request.getSession();

        // 2.获取session中的用户
        Object user = session.getAttribute("user");

        // 3.判断用户是否存在
        if (user==null) {

            // 4.不存在，拦截，返回 401 状态码
            response.setStatus(401);
            return false;
        }

        // 5.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser((UserDTO) user);

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
                                Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }
}
